@PerryWilson the Vagabond sollution looks interesting and economical, but I don't quite understand how it's connected to a GH2. I cant't see a 9V (or similar) output from the Vagabond?
Or do you plan using the Panasonic AC adaptor connected to the Vagabond? That would seem a little too bulky to me..

That looks really good, and would act well as a counterbalance on a shoulder rig too. 130W/h should give around 18 hours continuous usage :-D. All I need now is a 3TB SD card and I'm set.

Here's a little solution i adopted for my gh1 (but it should work with gh2 as well - would just need to replace the DCC3 ith DCC8 coupler) to power it up from V-lock batteries. It can also power the lights and whatever you have at the same time. All with one battery and it will still run for ages.
So it's basically this: http://www.ebay.com/itm/DSLR-BP-battery-Power-supply-V-mount-/270822043311?pt=US_Camera_Camcorder_Accessory_Bundles&hash=item3f0e406eaf that a friend of mine adjusted by adding 9.2V output (as i'm not very good with electronics/soldering myself).

Greetings, we were told about this thread concerning the GH2 power options, so I checked it out :-)
As No_SuRReNDeR already mentioned earlier, we make several adapters designed specifically for this great camera. The "Power Plate" solution allows to use common DV batteries as a source of power, the DC converter device powers the camera using any 12V-25V DC power source, so any battery that you already own, including car power, can be used. Please feel free to either post a question here of contact us directly, if have any specific question or a suggestion, will be happy to help with an answer/ custom solutions to your needs.
Alex Dolgin
Dolgin Engineering
http://dolgin.net/Power-Lumix.htm

re: eneloop

Saw other topic,.. what is the deal with this? Its a Li-Ion battery pack, but includes 2 outputs and an inbuilt current regulator?

Any ideas how long it would power the GH2 for?

Probably is the easiest way to power the GH2 if it works well... any one used or is it still too new?

Eneloop does have a very good name when it comes to batteries,... and unfortunately - like everything specs can lie so - so don't believe everything that batteries say...

This baby is the whole deal (charger included) for the same price of ONLY a Sony DV (Brandname) battery.

Correct me if I am wrong.

Cheers,
A

For people looking to step down a 12v power source to the 8.4v or 9v required by the GH2, I've had pretty good luck with this device:
http://www.simaproducts.com/products/product_detail.php?product_id=85

It's designed to plug into a 12v car accessory jack, but you can easily snip that off and attach whatever plug you need for your battery or battery distribution system. On the other end it comes with a bunch of different DC power plugs which are interchangeable, one of which fits into the GH2 DC Coupler (DMW-DCC8). The device has a switch for 5v, 6v, 8.4v, 9v, and 10v output (9v seems to work best for the GH2). I think the maximum current is 3 amps, but that should be enough for the GH2.

Sells for a little under $30 on Amazon:
http://www.amazon.com/Universal-Portable-DVD-Dc-Adapter/dp/B000BNNKJE

@7hau you are the man ;)

I've contacted the seller, he'll put up on ebay soon. He oso mention his modified battery grip(not sure about external battery) can show battery level in GH1 and currently in an effort to do that in GH2.

@7hau Nice find. I tried to run a google translate on some of the products. To me it seemes like this one includes both the external battery and the "empty battery insert":
http://translate.googleusercontent.com/translate_c?hl=en&ie=UTF8&prev=_t&rurl=translate.google.com&sl=zh-CN&tl=en&u=http://item.taobao.com/item.htm%3Fid%3D10666328140%26&usg=ALkJrhg4bF_DTzvx8Jw0uWnCrYn3eOvGKg

I hope some of this turns up on ebay with international shipping, and better descriptions :)

The battery and the coupler have arrived (for a while now). I tried to find a suitable adapter, but the guy at the electronics store told me the connection on the coupler side is not a common size. It would be cool if we could find out the precise type of connector to see if we can find an adapter. Otherwise, I guess we're stuck with soldering and checking polarity, right @Ptchaw? :-)

@Ptchaw the battery you linked was ~$24 on ebay when, a few months ago.

I'm glad to see the idea embraced here, that battery has everything you need beside the connector. It's a lot less trouble than building your own voltage regulator and battery housing. :)

@Ptchaw,

I believe the dimensions of the DC coupler connector are 1.7mm (inner diameter) and 4.75mm (outer diameter).

Do you know the tip dimensions of the 9v connector from the battery?